<template>
  <div v-if="Object.keys(detailInfo).length !== 0" class="goods-info">
    <div class="info-desc clear-fix">
<!--设定class="start"和class="end"是为了方便设置样式-->
      <div class="start"></div>
      <div class="desc">{{detailInfo.desc}}</div>
      <div class="end"></div>
    </div>
    <div class="info-key">{{detailInfo.detailImage[0].key}}</div>
    <div class="info-list">
      <img v-for="(item, index) in detailInfo.detailImage[0].list" :src="item" alt="" @load="imgLoad">
    </div>
  </div>
</template>

<script>
	export default {
		name: "DetailGoodsInfo",
    props: {
      detailInfo: {
        type: Object
      }
    },
    data(){
		  return{
		    counter: 0,
        imagesLength: 0
      }
    },
    methods: {
		  imgLoad(){
		    // 图片都加载出来，才会发射事件
		    if (++this.counter === this.imagesLength){
		      this.$emit('imageload')
        }
      }
    },

    watch: {
      // 在vue中，使用watch来响应数据的变化
      // 使用方法1
      // new Vue({
      //   el: '#root',
      //   data: {
      //     cityName: 'shanghai'
      //   },
      //   watch: {
      //     cityName(newName, oldName) {
      //       // ...
      //     }
      //   }
      // })
      detailInfo(){
		    this.imagesLength = this.detailInfo.detailImage[0].list.length
      }
    }
	}
</script>

<style scoped>
  .goods-info {
    padding: 20px 0;
    border-bottom: 5px solid #f2f5f8;
  }

  .info-desc {
    padding: 0 15px;
  }

  .info-desc .start, .info-desc .end {
    width: 90px;
    height: 1px;
    background-color: #a3a3a5;
    position: relative;
  }

  .info-desc .start {
    float: left;
  }

  .info-desc .end {
    float: right;
  }

  .info-desc .start::before, .info-desc .end::after {
    content: '';
    position: absolute;
    width: 5px;
    height: 5px;
    background-color: #333;
    bottom: 0;
  }

  .info-desc .end::after {
    right: 0;
  }

  .info-desc .desc {
    padding: 15px 0;
    font-size: 14px;
  }

  .info-key {
    margin: 10px 0 10px 15px;
    color: #333;
    font-size: 15px;
  }

  .info-list img {
    width: 100%;
  }
</style>
